code: def testDescending(self):
      input = [x / 99.0 for x in range(100)]
      input.reverse()
  
      output = self.helper(input)
  
      self.assertEqual(output[0], 0.0)
      self.assertEqual(output[1], 1.0)
  
file_path: essentia/test/src/unittests/sfx/test_derivativesfx_streaming.py
imports: from essentia_test import *
  from essentia.streaming import DerivativeSFX
label_desc: Use image node_id 5 for calling the TestDerivativeSfx_Streaming obj's underlying member method code with example usage: obj.testDescending() without return types